US6678294B1 - Distributed feedback laser apparatus for avoiding stimulated brillouin scattering - Google Patents
Distributed feedback laser apparatus for avoiding stimulated brillouin scattering Download PDFInfo
- Publication number
- US6678294B1 US6678294B1 US09/707,219 US70721900A US6678294B1 US 6678294 B1 US6678294 B1 US 6678294B1 US 70721900 A US70721900 A US 70721900A US 6678294 B1 US6678294 B1 US 6678294B1
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- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 34
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
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- 230000010287 polarization Effects 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims 1
- 230000004044 response Effects 0.000 abstract description 10
- 239000004065 semiconductor Substances 0.000 description 4
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- 238000012986 modification Methods 0.000 description 2
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- 230000002123 temporal effect Effects 0.000 description 2
- 108010014172 Factor V Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009021 linear effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/03—Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1307—Stabilisation of the phase
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
- H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
- H01S5/0622—Controlling the frequency of the radiation
Definitions
- the present invention relates to a distributed feedback laser apparatus, and more particularly to a distributed feedback laser apparatus that produces a dithered optical signal having a frequency versus time characteristic that is represented by a triangular waveform.
- a single laser source seeds all the fiber amplifiers.
- the source must provide a coherent common temporal coherence to all the fiber amplifiers in the array.
- coherent high power fiber arrays are limited in power by nonlinear processes that erode the mutual output phase coherence relative to that of the common seed source.
- the primary optical phase distortion mechanisms in these fiber amplifiers include four-wave mixing and cross phase modulation. These mechanisms can be suppressed by employing a single frequency laser source.
- SBS stimulated Brillouin scattering
- SBS is an inherent effect that occurs in fiber amplifiers in which a substantial fraction of the forward-propagating power in the amplifier is converted into backward propagating power with a slight downward frequency shift. This limits the power transfer through a fiber amplifier. SBS gain is dependent on beam intensity, spectral width, and fiber length. It should be recognized that SBS does not generally occur at low powers and for short lengths of optical fiber over which a signal is transmitted.
- SBS has occasionally been a problem for telecommunications applications, but has been mitigated by broadening the spectrum of the signal. This is accomplished by passing a narrow line signal from a distributed feedback source through a modulator to effectively broaden the linewidth of the source. This raises the SBS threshold and thus avoids the creation of SBS.
- This type of source is only available in very low power communications where the optical power is less than about 1 watt and the optical fiber is about 1 kilometer or greater. In these low power applications, repeaters are necessary along the optical fiber to amplify the optical signals passing therethrough.
- the system includes a current source for supplying a current signal and a distributed feedback laser that responds to the current signal and transmits a dithered optical signal having a frequency versus time characteristic that is represented in its most general form by an asymmetric triangular form.
- An optical medium includes a plurality of optical paths each having an optical fiber, a phase modulator and a fiber amplifier, and is characterized by a response time associated with stimulated Brillouin scattering (SBS).
- SBS stimulated Brillouin scattering
- the height of the triangular waveform is related to the SBS response time and amplifier parameters.
- the period of the waveform is shorter than the response time of the SBS or equal to the round trip optical transmit time in the fiber.
- the waveform is of the sawtooth type.
- FIG. 1 is a schematic diagram of the seed laser system in accordance with the present invention.
- FIG. 2 shows three waveforms of the dithered optical signal transmitted by the distributed feedback laser in accordance with the present invention.
- the present invention describes a seed laser apparatus, generally designated by the numeral 10 .
- the apparatus 10 includes an electronic driver 12 for providing a chirp electrical current signal to modulate and drive a distributed feedback (DFB) laser 14 .
- the DFB laser 14 is well known in the industry, comprises a semiconductor laser and includes a Bragg grating. It transmits an optical signal having a single output frequency that has a direct correspondence to its input drive current.
- the Bragg grating is characterized by an optical spacing which is, in turn, a function of the refractive index of the semiconductor gain media.
- injection of the drive current from the driver 12 changes the carrier density of the laser 14 and thus the effective index of refraction of the semiconductor gain media.
- the output optical signal transmitted by the DFB laser 14 is illustrated in FIG. 2 A. It has a triangular waveform and is designated by the numeral 20 . As shown the optical signal 20 is particularly a sawtooth triangular waveform with its frequency ramping linearly, increasing from a minimum frequency 22 to a maximum frequency 24 . At the maximum frequency 24 the frequency drops back to the minimum frequency 22 substantially instantaneously. The time for the cycle to occur is described as the dither time and identified as ⁇ dither . The optical signal repeats this ramp up and step down periodically during amplifier operation. The difference between the maximum frequency and the minimum frequency is referred to as chirp range of frequencies and shown as ⁇ chirp . At any instant of time the optical signal 20 is a single frequency.
- the frequency never dwells or remains relatively constant over any short period of time.
- the drive current supplied by the driver 12 corresponds directly to the shape of the optical signal 20 , and thus also has a sawtooth triangular waveform.
- FIG. 2B shows another optical signal that can be used, which is the mirror image of the sawtooth signal of FIG. 2 A.
- Another, more general, optical signal that can be employed is shown in FIG. 2C, which is an asymmetric triangular waveform where the upward and downward slopes are unequal. For optimum performance the duration of one of these slopes must be less than the SBS response time. The duration of the other slope must be greater than the optical round-trip time in the fiber amplifier.
- the shape of the optical signal is an important feature of this invention. It can not be a sinusoid because of the relatively constant frequency range at the dwell times, corresponding to 90° and 270°, of the sinusoidal pattern. It is expected that these flat range of dither frequencies will create or allow to occur the SBS associated with the fiber amplifiers included in the system, rather than eliminate or preclude the SBS from forming.
- a transmitted frequency pattern that has been found to be ineffective in suppressing non-linear effects, although it does serve to reduce SBS, is one containing a broadband comb of frequencies. More particularly, this broadband comb introduces other non-linear effects, such as four wave mixing, cross phase modulation and parametric amplification, and other third order non-linear effects as it broadens the spectrum as the signal is amplified in the fiber amplifier. This broadening destroys the temporal coherence of the amplified signal rendering it useless for coherent combining of multiple elements in a high power fiber array system.
- An optical fiber 30 transmits the optical signal 20 to a power divider 32 that comprises a plurality of optical fibers 34 , thus defining a plurality of optical paths, generally indicated by the numeral 36 . Because of the high power being transmitted a single optical fiber can not carry the power.
- a single optical fiber can not carry the power.
- the phase modulator 38 receives the split and divided optical signal and a feedback signal that adjusts polarization and phase.
- the fiber amplifier 40 has an input 42 and an output 44 .
- the fiber amplifiers 40 amplify the divided seed optical signals without changing their frequency or phase.
- a plurality of microlenses 46 form an array 48 and serve to collimate the amplified optical signals into a power beam 50 .
- a beam sampler 54 samples a portion of the collimated optical signals in the power beam and routes them through a feedback network 60 .
- the feedback network 60 comprises a plurality of phase front corrector sensors 62 and polarization and phase adjuster drivers 64 .
- the adjuster drivers 64 may be phase modulators, optical fiber stretchers or electro optic modulators and provide a time delay to the optical wave passing through the fiber so that all peaks and troughs of the optical signals 20 line up.
- the network 60 takes the plurality of sampled beams and develops a feedback signal for application to the phase modulators 38 to maintain the coherence of the phases of the plurality of optical signals 20 .
- ⁇ chirp is the chirp frequency range of the dithered signal
- ⁇ SBS is the line width of the SBS response
- g B is the gain coefficient of the SBS associated with the optical fiber
- L is the length of the optical fiber
- A is the effective area of the fiber optical mode
- G is the overall amplifier gain.
- the power P is 40% of the target amplifier power.
- the factor ⁇ /4 is for the case of a linear sawtooth ramp as shown in FIG. 2 A. It has been found that the SBS has a finite response time, i.e. the transient time. Thus, the dither retrace should be faster than the SBS response time of the fiber optical amplifier medium. Four wave mixing can not be generated because there is never more than one optical frequency at a given time.
- the revisit time for any frequency is the longer of two time scales.
- the two time scales are the round-trip photon transit time in the fiber amplifier and the reciprocal of the SBS bandwidth. This SBS threshold varies for a given fiber length and mode area and thus the dither format is a function of these parameters as shown by the equation.
- the DFB laser transmits a dither signal at the peak of the fiber amplifier gain spectrum (around 1.09 microns for Yb—glass fiber).
- the amplified beam generates output power between 10's to 100's of watts using fiber lengths between 10 and 50 meters.
- the DFB laser 14 In operation, the DFB laser 14 generates a dithered optical signal 20 having an asymmetric triangular (sawthooth in preferred embodiment) waveform.
- the waveform corresponds to the current drive produced by the chirp drive electronics 12 .
- the dithered optical signal 20 is divided by the power divider and conducted through a plurality of optical fibers 30 , each forming an optical path 36 .
- the optical signals are amplified by the fiber amplifiers 40 and collimated by the microlens array 48 into a power beam 50 . Because of the sawtooth waveform of frequencies supplied to the amplifiers 40 , which have a periodicity that is longer than the round-trip transit time or is shorter than the response time of the SBS associated with the fiber amplifiers, SBS is not created.
- the beam 50 is sampled and sent through an optical feedback network 60 , containing phase front corrector sensors 62 , and polarization and phase adjuster drivers 64 to phase modulators 38 at the input of the fiber amplifiers 40 .
- the feedback network 60 serves to maintain the coherence of the optical signals.
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
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- Optics & Photonics (AREA)
- Optical Communication System (AREA)
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US09/707,219 US6678294B1 (en) | 2000-11-06 | 2000-11-06 | Distributed feedback laser apparatus for avoiding stimulated brillouin scattering |
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Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070019283A1 (en) * | 2005-06-28 | 2007-01-25 | Fitel Usa Corp. | Suppression of stimulated brillouin scattering (SBS) in high power fiber amplifiers |
US20070019918A1 (en) * | 2005-07-20 | 2007-01-25 | Northrop Grumman Corporation | Apparatus and method for suppression of stimulated brillouin scattering in an optical fiber |
US20070248136A1 (en) * | 2006-04-19 | 2007-10-25 | Mobius Photonics, Inc. | Laser apparatus having multiple synchronous amplifiers tied to one master oscillator |
US20080013163A1 (en) * | 2006-07-11 | 2008-01-17 | Mobius Photonics, Inc. | Light source with precisely controlled wavelength-converted average power |
US7339727B1 (en) * | 2003-01-30 | 2008-03-04 | Northrop Grumman Corporation | Method and system for diffractive beam combining using DOE combiner with passive phase control |
US20080056642A1 (en) * | 2006-09-01 | 2008-03-06 | Mobius Photonics, Inc. | Reducing thermal load on optical head |
US7349637B1 (en) | 2003-02-11 | 2008-03-25 | Optium Corporation | Optical transmitter with SBS suppression |
US20080084605A1 (en) * | 2006-10-05 | 2008-04-10 | Rothenberg Joshua E | Method and system for hybrid coherent and incoherent diffractive beam combining |
WO2008086625A1 (en) * | 2007-01-18 | 2008-07-24 | Pyrophotonics Lasers Inc. | Seed source for high power optical fiber amplifier |
US20090010288A1 (en) * | 2007-07-05 | 2009-01-08 | Mobius Photonics, Inc. | Fiber mopa system without stimulated brillouin scattering |
US20090324256A1 (en) * | 2008-06-27 | 2009-12-31 | Fujitsu Limited | Optical transmitter |
WO2010046661A1 (en) * | 2008-10-24 | 2010-04-29 | Spi Lasers Uk Limited | Apparatus for combining laser radiation |
US20100110556A1 (en) * | 2008-11-04 | 2010-05-06 | Massachusetts Institute Of Technology | External-cavity one-dimensional multi-wavelength beam combining of two-dimensional laser elements |
US20110032602A1 (en) * | 2009-08-07 | 2011-02-10 | Northrop Grumman Space & Mission Systems Corp. | All-fiber integrated high power coherent beam combination |
US20110032604A1 (en) * | 2009-08-07 | 2011-02-10 | Northrop Grumman Space & Mission Systems Corp. | Passive all-fiber integrated high power coherent beam combination |
US20110032603A1 (en) * | 2009-08-07 | 2011-02-10 | Northcrop Grumman Space & Mission Systems Corp. | Integrated spectral and all-fiber coherent beam combination |
US20110222574A1 (en) * | 2010-03-09 | 2011-09-15 | Massachusetts Institute Of Technology | Two-dimensional wavelength-beam-combining of lasers using first-order grating stack |
US8503070B1 (en) * | 2011-05-24 | 2013-08-06 | The United States Of America As Represented By The Secretary Of The Air Force | Fiber active path length synchronization |
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US20140231618A1 (en) * | 2012-10-03 | 2014-08-21 | U.S. Army Research Laboratory Attn: Rdrl-Loc-I | Apparatus for Coherent Beam Combining in an Array of Laser Collimators |
US8953240B2 (en) | 2011-08-16 | 2015-02-10 | Telaris, Inc. | Frequency-chirped semiconductor diode laser phase-locked optical system |
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---|---|---|---|---|
US7339727B1 (en) * | 2003-01-30 | 2008-03-04 | Northrop Grumman Corporation | Method and system for diffractive beam combining using DOE combiner with passive phase control |
US20080075469A1 (en) * | 2003-02-11 | 2008-03-27 | Optium Corporation | Optical transmitter with sbs suppression |
US7349637B1 (en) | 2003-02-11 | 2008-03-25 | Optium Corporation | Optical transmitter with SBS suppression |
US20070019283A1 (en) * | 2005-06-28 | 2007-01-25 | Fitel Usa Corp. | Suppression of stimulated brillouin scattering (SBS) in high power fiber amplifiers |
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US20070248136A1 (en) * | 2006-04-19 | 2007-10-25 | Mobius Photonics, Inc. | Laser apparatus having multiple synchronous amplifiers tied to one master oscillator |
US7443903B2 (en) | 2006-04-19 | 2008-10-28 | Mobius Photonics, Inc. | Laser apparatus having multiple synchronous amplifiers tied to one master oscillator |
US20080013163A1 (en) * | 2006-07-11 | 2008-01-17 | Mobius Photonics, Inc. | Light source with precisely controlled wavelength-converted average power |
US7529281B2 (en) | 2006-07-11 | 2009-05-05 | Mobius Photonics, Inc. | Light source with precisely controlled wavelength-converted average power |
US20080056642A1 (en) * | 2006-09-01 | 2008-03-06 | Mobius Photonics, Inc. | Reducing thermal load on optical head |
US7469081B2 (en) | 2006-09-01 | 2008-12-23 | Mobius Photonics, Inc. | Reducing thermal load on optical head |
US20080084605A1 (en) * | 2006-10-05 | 2008-04-10 | Rothenberg Joshua E | Method and system for hybrid coherent and incoherent diffractive beam combining |
US7436588B2 (en) * | 2006-10-05 | 2008-10-14 | Northrop Grumman Corporation | Method and system for hybrid coherent and incoherent diffractive beam combining |
US7796654B2 (en) | 2007-01-18 | 2010-09-14 | Pyrophotonics Lasers Inc. | Seed source for high power optical fiber amplifier |
US20090080477A1 (en) * | 2007-01-18 | 2009-03-26 | Pyrophotonics Lascrs Inc. | Seed source for high power optical fiber amplifier |
WO2008086625A1 (en) * | 2007-01-18 | 2008-07-24 | Pyrophotonics Lasers Inc. | Seed source for high power optical fiber amplifier |
US20110206076A1 (en) * | 2007-01-18 | 2011-08-25 | Pyrophotonics Lasers, Inc. | Seed source for high power optical fiber amplifier |
WO2009006547A1 (en) * | 2007-07-05 | 2009-01-08 | Mobius Photonics, Inc. | Fiber mopa system without stimulated brillouin scattering |
US8009705B2 (en) * | 2007-07-05 | 2011-08-30 | Mobius Photonics, Inc. | Fiber MOPA system without stimulated brillouin scattering |
US20090010288A1 (en) * | 2007-07-05 | 2009-01-08 | Mobius Photonics, Inc. | Fiber mopa system without stimulated brillouin scattering |
US20090324256A1 (en) * | 2008-06-27 | 2009-12-31 | Fujitsu Limited | Optical transmitter |
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